Oleanane saponins from Bellis sylvestris Cyr. and evaluation of their phytotoxicity on Aegilops geniculata Roth

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• 作者：Monica Scognamiglio ; Brigida D’ ; Abrosca ; Vittorio Fiumano ; Angela Chambery ; Valeria Severino ; Nikolaos Tsafantakis ; Severina Pacifico ; Assunta Esposito ; Antonio Fiorentino ; ^{antonio.fiorentino@unina2.it} ; ^{antonio.fiorentino25@virgilio.it}
• 关键词：Bellis sylvestris Cyr. ; Asteraceae ; Saponins ; Besylvosides ; Spectroscopic analysis ; Aegylops geniculata Roth. ; Phytotoxicity
• 刊名：Phytochemistry
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：84
• 期：Complete
• 页码：125-134
• 全文大小：1105 K

文摘

Six oleanane saponins were isolated for the first time from leaves of Bellis sylvestris Cyr., the southern daisy. Their structures were established by the extensive use of 2D-NMR experiments, including COSY, TOCSY, NOESY, HSQC, HMBC, CIGAR, H2BC, and HSQC-TOCSY, along with Q-TOF HRMS² analysis. All of the compounds are constituted by bayogenin as aglycone, and characterized by the presence of an oligosaccharide moiety, consisting of two to four sugar unities esterified at the C-28 carboxyl carbon. One of the isolated compounds is a bisdesmoside containing an additional sugar moiety at the C-3 carbon.

The phytotoxic activity assayed against Aegilops geniculata Roth., a coexisting test species, has been evaluated revealing that all the compounds, at the highest concentrations, showed strong phytotoxicity against the leaf development.